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Kerabari Formation
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Kerabari Fm base reconstruction

Kerabari Fm

Period: 
Calymmian

Age Interval: 
early Calymmian


Province: 
Nepal Lesser Himalaya

Type Locality and Naming

Tansen and lower Kali Gandaki region.


Lithology and Thickness

Total of more than 2100 m. A thin lower Riri Limestone Member of platy, black, clayey limestone; 100-150 m thick. Then the main Kerabari Dolomite Member of thick- to very thick-bedded, laterally persistent and monotonous, light gray rock. This member is roughly subdivided into the following three parts of semi-equal relative thicknesses: Lower thin-bedded black shales and dolomite, middle bedded dolomicrite, upper platy to wedge-shapped dolomicrite beds.


Lithology Pattern: 
Dolomite


Relationships and Distribution

Lower contact

Rests conformably on the Ramdighat Fm limestone

Upper contact

Major unconformity (ca. 1 billion years) followed by the Sisne Fm (early Permian) at base of the Tansen Gr.

Regional extent


GeoJSON

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Fossils


Age 

Martin (2017) schematically suggests early-middle Calymmian (ca. 1550 Ma)

Age Span: 

    Beginning stage: 
Calymmian

    Fraction up in beginning stage: 
0.3

    Beginning date (Ma): 
1,540.00

    Ending stage: 
Calymmian

    Fraction up in the ending stage: 
0.35

    Ending date (Ma):  
1,530.00

Depositional setting

"The Kerabari Formation was deposited in shallow marine conditions of an inner shelf, intertidal zone, and lagoon. Subrounded quartz grains could have been originated from wind-blown sands."


Depositional pattern:  


Additional Information


Compiler:  

Descriptions from Megh Raj Dhital (2015, Geology of Nepal: Regional Perspective of the Classic Collided Orogen, Springer Publ., 499 pp.). Age spans estimated from correlation diagrams in Martin, A.J. (2017, "A review of Himalayan stratigraphy, magmatism, and structure", Gondwana Research, 49: 42-80; http://dx.doi.org/10.1016/j.gr.2017.04.031), but these are often controversial.